Simple enough to reproduce...

AnnotatedType<?> annotatedType = beanManager.createAnnotatedType(serviceType);
InjectionTarget injectionTarget = beanManager.createInjectionTarget(annotatedType);

Where serviceType is an Interface Class. A NPE results on the following call to createInjectionTarget because serviceType has no constructors....

java.lang.NullPointerException
at org.jboss.weld.util.Beans.getPostConstructMethods(Beans.java:246)
at org.jboss.weld.manager.SimpleInjectionTarget.<init>(SimpleInjectionTarget.java:85)
at org.jboss.weld.manager.BeanManagerImpl.createInjectionTarget(BeanManagerImpl.java:1006)
at org.switchyard.cdi.ServiceDeployer.addInjectableClientProxyBean(ServiceDeployer.java:86)